Self-contained hydraulic lash adjuster with pressurizing diaphra

Details Self-contained hydraulic lash adjuster with pressurizing diaphra Self-contained hydraulic lash adjuster with pressurizing diaphra

1991-12-16

1992-07-14

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9058, 123 9046, F01L 124

Patent

active

051293730

ABSTRACT:
A self-contained lash adjuster includes a closed end cylinder body and a plunger in the cylinder defining a pressure chamber at the closed end of the cylinder and an internal reservoir connected with the chamber by a one-way passage in the plunger. A diaphragm sealing the reservoir is loaded by a spring piston to pressurize the reservoir and apply a differential pressure extending force to the plunger. The plunger is preferably made in two parts with the diaphragm in the lower part defining the chamber and the piston in the upper part distal from the chamber. The two-part construction permits leakdown testing before permanent installation of the diaphragm. A seal in the lower part beyond a return port seals the plunger walls to the cylinder. Installation during assembly of excess fluid for make-up is controlled by positioning of the plunger lower part during filling in a hyper extended position beyond the fully extended position to which the plunger is limited after full assembly of the lash adjuster.

REFERENCES:
patent: 2109815 (1938-03-01), Best
patent: 2438631 (1948-03-01), Bergmann
patent: 2807251 (1957-09-01), Peras
patent: 2925074 (1960-02-01), Dadd
patent: 4191142 (1980-03-01), Kodama
patent: 4338894 (1982-07-01), Kodama
patent: 4385599 (1983-05-01), Hori et al.
patent: 4402285 (1983-09-01), Arai et al.
patent: 4457270 (1984-07-01), Kodama et al.
patent: 4462364 (1984-07-01), Kodama

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